Diffuser for exhaust gases



July 7, 1931.

w. J. MOORE 4 1,813,189

DIFFUSER FOR EXHAUST GASES 2 Sheets-Sheet 1 Filed March 10 1928 INVENTOR 4 /6104 [/700/95 ATTORNEY July 7, 1931. w. J. MOORE 1,813,189

DIFFUSER FOR EXHAUST GASES Filed March 10, 1928 2 Sheets-Sheet 2 INVENTOR fu/a/vf/ aaie ATTORN EY Patented July 7, 1931 UNITED sTATEs PATENT OFFICE WILLIAM .nmoonn, or nnoonam, NEW ionic, ASSIGNOR T noiuic CORPORATION, OF NEW Yonx, N. Y., A conroaarrou or NEW YORK DIFFUSER FOB. EXHAUST G ASES A pplication filed March 10, 1928. Serial No. 260,568.

This invention relates to a device adapted to lie close to the ground where they remain,

for a period of time, mgre or less undifiused 1n the surrounding a r. These gas bodies are.

often shot out of the-exhaust'pipe with con-' siderable velocity so that they reach a point far enough removed from the machine to envelop passers-by before a sufficient diffusion takes place to render such immersion disagreeable if not injurious.

It is the purpose of/this invention to give the gases an initial dilution so that the gas cloud shall'contain a smaller percentage of of the obnoxious gases, such'as CO, as it emerges from the exhaust pipe. Such dilution will not only lessen the percentage of the gases, but the diluted mixture will'have a less specific gravity and will therefore be carried more easily over the heads of people. The visibility of smoke will alsobe reduced by such dilution. The diffusion also results in a decreasedwelocity of ejection whereby rear of a car, thus bringing-about a still greater dispersion before the gases reach the neighborhood of passers by.

According to my present invention the di lution of the gases is desirably accomplished by means of an attachment to the discharge end of the exhaust pipe, the diffuser utilizing the velocity of the exhaust gases todraw air into it and mix it with the gases previous to their discharge into the atmosphere. The device acts therefore as an aspirator, and the invention also contemplates a special form of aspirator for more eflicientlfv accomplishin this purpose.

ome preferred forms that the invention may take are illustrated in the accompanying drawings, in which: Y

Figure 1 is a side view of an automobile equipped with my invention, part of the car I body being shown broken away to disclose the gases are caused to remain closer to the.

the attachment and its relation to' the exhaust pipe;

Fig. 2 shows a longitudinal section of the device on the line 22 of Fig. 4;

Fig. 3 is a side view of the same;

Fig. 4 is a plan view; Fig. 5 is a transverse section on the line 55 of Fig. 2; p I

Fig. 6. is a longitudinal section of a modification, and

Fig. 7 is a transverse sectional view of such modified form on the line 7-7 of Fig. 6.

The difi'user 1 has a tubular neck 2 adapted to fit over the end of the exhaust pipe 3, the joint between the two being preferably packed.

In the form shown in Figs. 1 to 5 the diffuser is made with a restr'cted neck 4 that acts somewhat as a Venturi t be whereby suction is produced along the i ner walls of the outwardly flaring. extensi n or conduit '5. Orifices or slots 6 in these walls permit the outside air to be drawn inin a direction substantially paralleling the gas stream, and this drawing in of outside airis accelerated bywings 7 that act as louvers to guide the air into the diffuser as the car moves forward. The suction efl'ect is'also increased by the inward lips 7a. The entering air will mix in vortices with the gases in the chamber of the flaring extension 5, and givesuch a dilution of the gases as to render them practically unobjectionable when inhaled.

As there may be more or less of a neutral zone or core in the center of the stream of gases which issue from the contracted orifice 4a in the neck, Tmay add an additional set of louvers- 8 within the, aspirator, that will cause air to flow in through additional, preferably side, apertures 9 and be discharged at openings or ports 10 in an interior chamber, in the center of the aspirator to break up and dilute the gases in the central gas zone.

In Figs. 25, the diffuser or'aspirator is shown as having its flaring extension 5 flat-' tened, so that it has considerable width, while the tubular neck 2 is gradually thinned to the neck 4 and enlarged laterally, the result being that the contracted "orifice 4a partakes of the form of a narrow slot. The difiuser showni in Figs. 25 may be conveniently made of two similar sheet metal sections rigidly secured to gether to provide closedjoints at their opposite edges.

In Fig. 7 a modified form is shown, where there is no restriction of the exhaust passage and where the flaring extension 15 is made up of a series of overlapping conical louvers united by bijdgepie'ces 17, and having induction passag s 16 on their smaller inner ends that give by the combined aspirating action of the gaseous velocity and the forced draft action of the mot-ion of the car the desired effect of diluting and diffusing the gases.

It is an important feature of the diffuser that the gases enter a chamber having a larger cross section and that the air openings lead into this chamber from theside or end opposite the discharge opening so that the air is inducted ordrawn into the chamber. This is aided by the chamber having a flaring shape.

With a diffuser such as described attached to a car the engine may even be run in a conenlarged ports opening into the central zone of the diffuser.

4. LA difiuser for exhaust gases, COIIIPIlSlIlg a chamber having upper and lower rearward- WILLIAM J. MGORE.

pates the gases, even when smoky, so asto 1 make them quite innoxious to persons in the vicinity.

It is evident that the diffuser or aspirator may be made in many difl'erent forms from those shown and still come within the scope of the appended claims.

What I claim as new, is:

1. A difl'user for exhaust gases, comprising a chamber adapted to be attached to an exhaust outlet and having a maximum cross section greater than that of the exhaust outlet, and external louvers adjacent to open ings in the wall of the chamber and projecting. in the direction of the exhaust'outlet, for deflecting air into sa'dchamber, and iifternal rearwardly and inwardly projected lips at the said wall openings through which outside air is inducted into the chamber.

2. A diffuser for the dilution'of exhaust gases, comprising a chamber adapted to be attached to an exhaust outlet and form an extelfsion thereof, said chamber having a maximum cross section greater than that of the exhaust outlet and formed with openlngs in its wall for permitting. induced air to enter the chamber to mix with the gases adj acent to the chamber walls,said chamber being formed with additional air inlet openings and conduits leading therefromto an innermost zone of the chamber.

3. A diffuser for exhaust gases having an opening for admission of gases,.a larger open: ing for the discharge of diflused gases outwardly, flaring walls from the smallertoward the larger opening, air admissionopenings in the flaring walls, an interior chamber having conduit connection to air inlet openings in the sides of the diffuser and 

